Hi @Agnese ,
Welcome to Microsoft Q&A platform and thanks for your query.
Unfortunately Project Online is not supported by ADF currently. I would suggest you to please up-vote and/or comment on below feature request suggestion which would help to increase the priority of the feature request.
ADF User voice forum : Project Online support in ADFv2
Hope this info helps.
Please do consider to click on "Accept Answer" and "Up-vote" on the post that helps you, as it will be beneficial to other community members.